The present invention enables recognition of whether or not content is also present outside of a display area. A content generation device (2) comprises: an assessment means for assessing, when content virtually arranged in a real space is displayed in a display area having a transparent outer frame, whether or not this content is larger than or equal to a prescribed size relative to the display area; and a highlighting means for highlighting the termination of the content that is assessed to be larger than or equal to the prescribed size relative to the display area.
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